Heat insulating and acoustic plaster



Jan. 5, 1932 a A. NEW

I HEAT INSULATING AND ACOUSTIC PLASTER Filed Oct. 4, 1930' FIEJ FIG. '2

INVENTOR v Gaff/9V! 4. NEW

.4 TTORNE Y Patented Jan. 5, 1932 UNITED STATES PATENT OFFICE GUs'rAvn [mom m'nnor roar CLINTONjOHIO, Assroxon "r0 THE AMERICAN on: so! 00., 01' Your CLINTON, 01110 A oonrona'rron' or 01110 m'r INSULATING AND ACOUSTIC PLLSTER umion fled October 4, 1930. Serial at. 488,359

This invention relates'to a heat insulating and acoustic plaster which has for its purpose toprovide a plaster composition which w1ll combine sound-absorbing and heat and cold insulating qualities.

The demand for acoustic plaster is becom ing (greater every day. Such plaster is aphe over various surfaces, such as plasterard, etc., but generally over a so-called brown plaster coat. This brown coat consists of a mixture of approximately parts of gypsum plaster and 75 parts of sand with a little fibre and retarder. Inasmuch as a wall made of this material is very dense and hard, it has very little insulating qualities'against heat and cold. If acoustic plaster is applied over same- V inch thick as a rule, the soundabsorbing coeflicient is derived from this up plication itself and lowered on account of the hardness or density of the underlaying base coat. The coeflicient, however, is greatly increased if the base coat is of a sound-absorbing nature in which it renders a two-fold purpose; increased sound-absorbing coeflicient as well as insulating values.

'To accompli h this, I mix with the gypsum stucco, instead of sand, a suflicient amount of a heat and cold resisting softand porous ma- .terial such as zonolite or Rockwool, etc.

Zonolite is a granular, very-light material weighing only 8 pounds per cubic foot and it mixes well with stucco. It is a non-metallic mineral'composed of silica, magnesia and alumina, found in Montana, and used for heat insulating. On account of its bulk and smooth surface the spreading or covering capacity is greatly increased over the sanded plaster and it works considerable more free under the trowel.

After the material (this base coat) is dry, it is not only suificiently hard, but porous enough to make it an ideal insulator.

On account of the great bulk of zonolite,

the amountweightover sand in this base coat has to be reduced considerably, making this material also very economical.

the insulating plaster described has soundabsorbing qualities.

For purpose of illustration, Fig. lshows a plan view of the plaster and Fig. 2 is a section.

In these drawings, 6 indicates the base coat which as stated consists of a mixture of gypsum and zonolite or similar material of granular and somewhat fibrous quality having the form'of small particles or shreds which make the coating sufliciently porous to have heat insulating and also somewhat sound-absorbing qualities. Upon this is applied the outer or face coating'of so-called acoustic plaster indicated at 7 which may be any of the known compositions for this purpose, being somewhat soft and chalky in quality and having its surface broken by a multiplicity of fine depressions or interstices indicated at 8, which may be produced by a proper tool or implement and which gives it the sound-absorbing quality characterized by the term acoustic plaster.

The combination of the two coats produces a plaster or wall covering having both heat.

' gypsum stucco mixed with. .heat insulating and sound absorbing fibrous material,-and a finish coat having sound-absorbing interstices.

ture.

GUSTAVE ADOLPH NEW.

- The principal idea in this development lies I in the combination of an insulating plaster,

as a base-coat and acoustic plaster as a finish coat, but this insulating base coat may be .cc In testimony whereof, I do aflix my signa- 

